// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/aura/scoped_window_targeter.h"

#include <utility>

#include "ui/aura/window.h"

namespace aura {

ScopedWindowTargeter::ScopedWindowTargeter(
    Window* window,
    scoped_ptr<ui::EventTargeter> new_targeter)
    : window_(window)
    , old_targeter_(window->SetEventTargeter(std::move(new_targeter)))
{
    window_->AddObserver(this);
}

ScopedWindowTargeter::~ScopedWindowTargeter()
{
    if (window_) {
        window_->RemoveObserver(this);
        window_->SetEventTargeter(std::move(old_targeter_));
    }
}

void ScopedWindowTargeter::OnWindowDestroyed(Window* window)
{
    CHECK_EQ(window_, window);
    window_ = NULL;
    old_targeter_.reset();
}

} // namespace aura
